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(ModeL) 2 Sheets-Sheet 1.

A. J. HUB-TU. SEWING MACHINE;

No. 315,037. Patented Apr. 7, 1885.

N. PETERS. Fhnlo-Ulhogmphu. wahin m. D. c.

(ModeL) 2 Sheets-Sheet 2.

A. J. HURTU.

. SEWING MACHINE. N0. 315 037. Patented Apr. 7, 1885.

UNITED STATES PATENT OFFICE.

AUGUSTE J. HURTU, OF PARIS, FRANCE.

SEWING-MACHINE.

SPEGIFECATION forming part of l etters Patent No. 315,037, dated April 7, 1885.

Application filed October 2, 1883.

. duce a sewing-machine which may be run at a higher rate of speed without injury to the machine than has heretofore been attainable; and the improvement consists, essentially, in a peculiar arrangement of cranks in pairs, com

bined with the driving-shaft and hook-shaft,

- showing the combination of cranks.

and also with an intermediate eccentric shaft, by which combination of parts the rotation of the hook is caused at certain points in its circuit to be accelerated and at others retarded.

In the accompanying drawings, Figure 1 is a sectional elevation of a sewing-machine embodying my improvement. Fig. 2 is a plan view of the same,-partly in section, and having a portion of the bed-plate broken away, Fig. 3 is a detail view showing the relative positions of the needle and the hook at the commencement of the first quarter of the rotation of the driving-shaft. Fig. 3 shows the relative position of the cranks at a corresponding point tothat shown in Fig. 3. Fig. 4. shows the relative position of the hook and the needle at the beginning of the second quarter of the rotation of the driving-shaft. Fig. 4 shows the relative position of the cranks at a corre- (ModeL) necting-rod, B. The other end of said connecting-rod B is pivotally connected to one end of a crank, (J, secured on a shaft, H.

A designates a crank, which is rigidly affixed at one end to a driving-shaft, K. Said crank A, near the outer end, is pivotally connected to one end of a connecting rod, B. The other end of the connecting-rod Bis pivotally connected to one end of a crank, 0, secured on the shaft H. The cranks G C may be arranged in line one with the other. The shaft H is journaled in a bearing, M, upon the bed-plate of the machine. Said shaft is cocentric to the shafts K K, which preferably will be in line.

E is a hook for looping the thread which passes the needle. It is attached to a holder secured to the shaft K. The crank A is preferably arranged upon the hook-shaft and the crank A upon the driving-shaft in such manner that, supposing the operator to occupy a position at the end of the machine looking in the direction of the arrow .X, (shown at Fig. 1,) the said cranks shall both be in a horizonholder shall have reached the lowest point in its stroke. The shafts K K are journaled in suitable hearings on the bed-plate of the ma chine. The lower portions of these bearings, as also that of the bearing M, are secured to the upper portions by means of screws orholder K is provided with a weight, 6, which tal position to the right when the needleacts as a counter-balance to it and the hook. The hook is curved longitudinally, so that it will approximately form a segment of the circle in which it rotates. At its forward end it preferably tapers to a point. The loop of thread in its passage over the port-ion of the hook between the holder and the portion just described may be guided thereon by any suitable guide.

0 is a holder, made in the ordinary or any other suitable manner, and held in place by a spring, 9, as is more clearly shown in Fig. 1. In the holder 0 is supported the bobbin N, from which the lower thread is supplied.

L is a pulley affixed to the outer end of the driving-shaft K, by means of which motion is conveyed to thesaid driving-shaft. The driving-shaft has arranged upon it a cam, K in which are inclined peripherical grooves 70.

S is a lever fulcrumed at S to an arm, R, which is made integral with the bed of the machine. At the lower extremity of the lever S there is pivoted a friction-roller, Z, at right angles to the said lever. This friction-roller is adapted to be reciprocated within the inclined groove 70 of the cam. K by which means motion is imparted to the lever S. To the other extremity of the lever S is connected by a link the needle-bar P. Said needle-bar is adapted to be reciprocated in bearings 10 p upon the bifurcated end of the fixed arm R, and is provided at its lower end with the usual 'means for securing the needle.

V is a lever fulcrumed at V to the arm B. At the upper end it operates a device for straining or stretching the thread. To the lower extremity of the lever V is pivoted a friction-roller, Z, at right angles thereto. This friction-roller is adapted to be reciproeated' within the inclined peripherical groove 70 of the cam K by which means motion is conveyed to the lever V. The thread f after leaving the spool is made to pass around the tension device U, thence around a small pulley, T, pivotally connected to the arm B, thence through a guide, T, thence over the stretching device, thence back through the guide T, thence over a pulley, T pivotally connected to the bearing 12 for the needle-bar, and thence through the eye of the needle.

I will now describe more in detail the operation of the mechanism for accelerating and retarding the movement of the hook.

On referring to-Fig. 1 and the detail Figs.3 and 3 it is seen that the needle R" has en- 7 tirely descended to form the loop, and that the operator occupies the position before mentioned.

After the first quarter. of a rotation of the driving-shaft the different parts above mentioned will occupy the position shown by Figs. at and 4. The hook has withdrawn the loop of thread from the needle, and by an accelerated movement has drawn it around the shuttle, making half a revolution around the axis of the shaft by which it is carried, so that its point is underneath the shaft. The needle has partially reascended, leaving the quantity of thread necessary for the enlargement of the loop passing around the shuttle. The great extent of movement of the hook as compared with the extent of rotation of the drivingshaft and the movement of the crank A mounted thereon illustrated by these Figs. 4 and 4 as due to this quarter-rotation indicates the great amount of acceleration which is effected in the movement of the hook.

Figs. 5 and 5 show the position of the mechanism after the second quarter of a rotation of the driving-shaft, during which the hook moves approximately at the same speed as the driving-shaft. During this movement it lets go the loop, the needle ascends completely, the stretcher takes up the slack, and the stitch is completed.

Figs. 6 and 6 show the mechanism at the end of the third quarter of a rotation of the driving-shaft, duringwhich the hook has slackened its movement, and only makes one-eighth of a turn. At the same time the stitch is tightened, and the needle begins to descend. Finally, during the last quarter of a turn of the driving-shaft, the hook effects its last eighth of a rotation with the same slackened movement as before, and returns with the various parts to the point of departure. During the last part of the movement the needle has continued to descend, and has formed a new loop, which will be caught by the hook to make a new stitch, and so on.

By comparing the positions of the parts illustrated by Figs. 3, 8, by Figs. 4, 4., by Figs. 5, 5, and by Figs. 6, 6 the relative extent of the movements of the hook and the driving-shaft may be appreciated. The extent of the movement of the driving-shaft during its several quarter-rotations may be ascertained by observing the positions occupied by the crank A, which is carried by the driving shaft.

The -presser-bar, the feed, the cam which operates the stretching device, and the stitchregulating device have only been shown incidentally, as I do not claim any features of them, and they may be of any suitable kind. I may slacken or accelerate the speed of the hook E by varying the angles of the cranks O G relatively to each other. 1

What I claim as my invention, and desire to secure by Letters Patent, is

In a sewing-machine, the combination, with a reciprocating needle, of a fixed spool or shuttle, N, a driving-shaft, K, provided with a crank A of the shaft K and the crank G of crank, A, a shaft, K, provided with a crank, the shaft H, substantially as specified. IO A, a hook 011 said shaft, a shaft, H, arranged In testimony that I claim the foregoing I eccentrically t0 the shafts K K, and provided have hereunto set my hand. i

with cranks O G, the connecting-rod B, piv- A. J. HURTU. otally connected to the crank A of the shaft Witnesses: K and the crank G of the shaft H, and the r G. BARDIN,

connecting-rod B, pivotally connected to the E1). MARTAIN. 

